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May be you have placed the game wrong.. ISO and CSO should go in the x:\ISO folder in the root directory. In
the same level where x:\PSP folder is at. If you dont have an ISO
folder just make one. Also take note that unless your PSP has a custom
firmware installed you can't play pirated games.
Video files should be located in the x:\VIDEO folder.
Mp3 are placed in the x:\MUSIC folder
images are placed in the x:\PICTURE folder.
Hmmm, where exactly did you pay to download these files? As far as I know there is no legal site to download cso/iso files from. Cso is nothing more than a compressed iso image of a psp disc. I cannnot really tell you how to make them work on your psp due to legal reasons on this site but I can tell you that they will only work on a soft-modded psp (which is a violation of the tos for the psp). If you are staying legal, then you have wasted your money on that site. Sorry. Now, as a side note, I do not agree with not being able to legally back up software or games that we have purchased.
Your CSO/ISO files should be in your ISO folder in the root of your memory stick. You might have to make this folder if you don't already have it. Also, your UMD mode have to be set to NO UMD REQUIRED, or M33 Driver. You must have Custom Firmware to play ISO/CSO games.
If you can't read ISO/CSO Files, that either means that you didn't download correctly or that you didn't place them in the ISO folder of your memory stick. If you can't play UMD games and you have custom firmware, make sure "execute boot.bin" and plain modules" are disabled under the recovery menu. If you have official firmware, you can't play ISO/CSO games unless you have Devhook. If you have official firmware and you can't read UMD games, then it's probably your lens.